Response of Sorghum (Sorghum bicolor L.) to Residual Phosphate in Soybean-Sorghum and Maize-Sorghum Crop Rotation Schemes on Two Contrasting Nigerian Alfisols

Table 8

Influence of crop effects and P-sources on biomass yield (g/pot) of Sorghum in the second cropping.

Treatment		Dry biomass (g/pot)	RAE (%)	Dry biomass (g/pot)	RAE (%)
		⁢First cutting		⁢Second cutting
Crop effects	Phosphate fertilizer
Maize-Sorghum	Control	1.81		0.03
	Morocco Rock	1.56	78.13	0.06	ND
	Sokoto Rock	1.86	ND	0.06	ND
	Single Super	1.49	100	0.03	100
Soybean-Sorghum	Control	2.39		0.2
	Morocco Rock	2.44	ND	0.15	ND
	Sokoto Rock	1.98	ND	0.2	ND
	Single Super	2.64	100	0.16	100
LSD (5%)		0.66		NS

RAE = relative agronomic efficiency of the Phosphorus- (P-) sources = [((yield of GRP − yield of Control)/(yield of SSP − yield of Control)) × 100]%.
NS = nonsignificantly different at .
LSD = least significant difference (5%) and ND = not determined.